/**
* @author sole / http://soledadpenades.com
* @author mr.doob / http://mrdoob.com
* @author Robert Eisele / http://www.xarg.org
* @author Philippe / http://philippe.elsass.me
* @author Robert Penner / http://www.robertpenner.com/easing_terms_of_use.html
* @author Paul Lewis / http://www.aerotwist.com/
* @author lechecacharro
* @author Josh Faul / http://jocafa.com/
*/

var TWEEN = TWEEN || ( function () {

var i, tl, interval, time, fps = 60, autostart = false, tweens = [];

return {

setFPS: function ( f ) {

fps = f || 60;

},

start: function ( f ) {

if( arguments.length != 0 ) {
this.setFPS( f );
}

interval = setInterval( this.update, 1000 / fps );

},

stop: function () {

clearInterval( interval );

},

setAutostart: function ( value ) {

autostart = value;

if(autostart && !interval) {
this.start();
}

},

add: function ( tween ) {

tweens.push( tween );

if (autostart && !interval) {

this.start();

}

},

getAll: function() {

return tweens;

},

removeAll: function() {

tweens = [];

},

remove: function ( tween ) {

i = tweens.indexOf( tween );

if ( i !== -1 ) {

tweens.splice( i, 1 );

}

},

update: function (_time) {

i = 0; num_tweens = tweens.length;
var time = _time || Date.now();

while ( i < num_tweens ) {

if ( tweens[ i ].update( time ) ) {

i++;

} else {

tweens.splice( i, 1 );
num_tweens--;

}

}

if (num_tweens == 0 && autostart == true) {

this.stop();

}

}

};

} )();

TWEEN.Tween = function ( object ) {

var _object = object,
_valuesStart = {},
_valuesDelta = {},
_valuesEnd = {},
_duration = 1000,
_delayTime = 0,
_startTime = null,
_easingFunction = TWEEN.Easing.Linear.EaseNone,
_chainedTween = null,
_onUpdateCallback = null,
_onCompleteCallback = null;

this.to = function ( properties, duration ) {

if( duration !== null ) {

_duration = duration;

}

for ( var property in properties ) {

// This prevents the engine from interpolating null values
if ( _object[ property ] === null ) {

continue;

}

// The current values are read when the tween starts;
// here we only store the final desired values
_valuesEnd[ property ] = properties[ property ];

}

return this;

};

this.start = function (_time) {

TWEEN.add( this );

_startTime = _time ? _time + _delayTime : Date.now() + _delayTime;

for ( var property in _valuesEnd ) {

// Again, prevent dealing with null values
if ( _object[ property ] === null ) {

continue;

}

_valuesStart[ property ] = _object[ property ];
_valuesDelta[ property ] = _valuesEnd[ property ] - _object[ property ];

}

return this;
};

this.stop = function () {

TWEEN.remove( this );
return this;

};

this.delay = function ( amount ) {

_delayTime = amount;
return this;

};

this.easing = function ( easing ) {

_easingFunction = easing;
return this;

};

this.chain = function ( chainedTween ) {

_chainedTween = chainedTween;

};

this.onUpdate = function ( onUpdateCallback ) {

_onUpdateCallback = onUpdateCallback;
return this;

};

this.onComplete = function ( onCompleteCallback ) {

_onCompleteCallback = onCompleteCallback;
return this;

};

this.update = function ( time ) {

var property, elapsed, value;

if ( time < _startTime ) {

return true;

}

elapsed = ( time - _startTime ) / _duration;
elapsed = elapsed > 1 ? 1 : elapsed;

value = _easingFunction( elapsed );

for ( property in _valuesDelta ) {

_object[ property ] = _valuesStart[ property ] + _valuesDelta[ property ] * value;

}

if ( _onUpdateCallback !== null ) {

_onUpdateCallback.call( _object, value );

}

if ( elapsed == 1 ) {

if ( _onCompleteCallback !== null ) {

_onCompleteCallback.call( _object );

}

if ( _chainedTween !== null ) {

_chainedTween.start();

}

return false;

}

return true;

};

/*
this.destroy = function () {

TWEEN.remove( this );

};
*/
}

TWEEN.Easing = { Linear: {}, Quadratic: {}, Cubic: {}, Quartic: {}, Quintic: {}, Sinusoidal: {}, Exponential: {}, Circular: {}, Elastic: {}, Back: {}, Bounce: {} };


TWEEN.Easing.Linear.EaseNone = function ( k ) {

return k;

};

//

TWEEN.Easing.Quadratic.EaseIn = function ( k ) {

return k * k;

};

TWEEN.Easing.Quadratic.EaseOut = function ( k ) {

return - k * ( k - 2 );

};

TWEEN.Easing.Quadratic.EaseInOut = function ( k ) {

if ( ( k *= 2 ) < 1 ) return 0.5 * k * k;
return - 0.5 * ( --k * ( k - 2 ) - 1 );

};

//

TWEEN.Easing.Cubic.EaseIn = function ( k ) {

return k * k * k;

};

TWEEN.Easing.Cubic.EaseOut = function ( k ) {

return --k * k * k + 1;

};

TWEEN.Easing.Cubic.EaseInOut = function ( k ) {

if ( ( k *= 2 ) < 1 ) return 0.5 * k * k * k;
return 0.5 * ( ( k -= 2 ) * k * k + 2 );

};

//

TWEEN.Easing.Quartic.EaseIn = function ( k ) {

return k * k * k * k;

};

TWEEN.Easing.Quartic.EaseOut = function ( k ) {

return - ( --k * k * k * k - 1 );

}

TWEEN.Easing.Quartic.EaseInOut = function ( k ) {

if ( ( k *= 2 ) < 1) return 0.5 * k * k * k * k;
return - 0.5 * ( ( k -= 2 ) * k * k * k - 2 );

};

//

TWEEN.Easing.Quintic.EaseIn = function ( k ) {

return k * k * k * k * k;

};

TWEEN.Easing.Quintic.EaseOut = function ( k ) {

return ( k = k - 1 ) * k * k * k * k + 1;

};

TWEEN.Easing.Quintic.EaseInOut = function ( k ) {

if ( ( k *= 2 ) < 1 ) return 0.5 * k * k * k * k * k;
return 0.5 * ( ( k -= 2 ) * k * k * k * k + 2 );

};

//

TWEEN.Easing.Sinusoidal.EaseIn = function ( k ) {

return - Math.cos( k * Math.PI / 2 ) + 1;

};

TWEEN.Easing.Sinusoidal.EaseOut = function ( k ) {

return Math.sin( k * Math.PI / 2 );

};

TWEEN.Easing.Sinusoidal.EaseInOut = function ( k ) {

return - 0.5 * ( Math.cos( Math.PI * k ) - 1 );

};

//

TWEEN.Easing.Exponential.EaseIn = function ( k ) {

return k == 0 ? 0 : Math.pow( 2, 10 * ( k - 1 ) );

};

TWEEN.Easing.Exponential.EaseOut = function ( k ) {

return k == 1 ? 1 : - Math.pow( 2, - 10 * k ) + 1;

};

TWEEN.Easing.Exponential.EaseInOut = function ( k ) {

if ( k == 0 ) return 0;
        if ( k == 1 ) return 1;
        if ( ( k *= 2 ) < 1 ) return 0.5 * Math.pow( 2, 10 * ( k - 1 ) );
        return 0.5 * ( - Math.pow( 2, - 10 * ( k - 1 ) ) + 2 );

};

//

TWEEN.Easing.Circular.EaseIn = function ( k ) {

return - ( Math.sqrt( 1 - k * k ) - 1);

};

TWEEN.Easing.Circular.EaseOut = function ( k ) {

return Math.sqrt( 1 - --k * k );

};

TWEEN.Easing.Circular.EaseInOut = function ( k ) {

if ( ( k /= 0.5 ) < 1) return - 0.5 * ( Math.sqrt( 1 - k * k) - 1);
return 0.5 * ( Math.sqrt( 1 - ( k -= 2) * k) + 1);

};

//

TWEEN.Easing.Elastic.EaseIn = function( k ) {

var s, a = 0.1, p = 0.4;
if ( k == 0 ) return 0; if ( k == 1 ) return 1; if ( !p ) p = 0.3;
if ( !a || a < 1 ) { a = 1; s = p / 4; }
else s = p / ( 2 * Math.PI ) * Math.asin( 1 / a );
return - ( a * Math.pow( 2, 10 * ( k -= 1 ) ) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) );

};

TWEEN.Easing.Elastic.EaseOut = function( k ) {

var s, a = 0.1, p = 0.4;
if ( k == 0 ) return 0; if ( k == 1 ) return 1; if ( !p ) p = 0.3;
if ( !a || a < 1 ) { a = 1; s = p / 4; }
else s = p / ( 2 * Math.PI ) * Math.asin( 1 / a );
return ( a * Math.pow( 2, - 10 * k) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) + 1 );

};

TWEEN.Easing.Elastic.EaseInOut = function( k ) {

var s, a = 0.1, p = 0.4;
if ( k == 0 ) return 0; if ( k == 1 ) return 1; if ( !p ) p = 0.3;
        if ( !a || a < 1 ) { a = 1; s = p / 4; }
        else s = p / ( 2 * Math.PI ) * Math.asin( 1 / a );
        if ( ( k *= 2 ) < 1 ) return - 0.5 * ( a * Math.pow( 2, 10 * ( k -= 1 ) ) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) );
        return a * Math.pow( 2, -10 * ( k -= 1 ) ) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) * 0.5 + 1;

};

//

TWEEN.Easing.Back.EaseIn = function( k ) {

var s = 1.70158;
return k * k * ( ( s + 1 ) * k - s );

};

TWEEN.Easing.Back.EaseOut = function( k ) {

var s = 1.70158;
return ( k = k - 1 ) * k * ( ( s + 1 ) * k + s ) + 1;

};

TWEEN.Easing.Back.EaseInOut = function( k ) {

var s = 1.70158 * 1.525;
if ( ( k *= 2 ) < 1 ) return 0.5 * ( k * k * ( ( s + 1 ) * k - s ) );
return 0.5 * ( ( k -= 2 ) * k * ( ( s + 1 ) * k + s ) + 2 );

};

//

TWEEN.Easing.Bounce.EaseIn = function( k ) {

return 1 - TWEEN.Easing.Bounce.EaseOut( 1 - k );

};

TWEEN.Easing.Bounce.EaseOut = function( k ) {

if ( ( k /= 1 ) < ( 1 / 2.75 ) ) {

return 7.5625 * k * k;

} else if ( k < ( 2 / 2.75 ) ) {

return 7.5625 * ( k -= ( 1.5 / 2.75 ) ) * k + 0.75;

} else if ( k < ( 2.5 / 2.75 ) ) {

return 7.5625 * ( k -= ( 2.25 / 2.75 ) ) * k + 0.9375;

} else {

return 7.5625 * ( k -= ( 2.625 / 2.75 ) ) * k + 0.984375;

}

};

TWEEN.Easing.Bounce.EaseInOut = function( k ) {

if ( k < 0.5 ) return TWEEN.Easing.Bounce.EaseIn( k * 2 ) * 0.5;
return TWEEN.Easing.Bounce.EaseOut( k * 2 - 1 ) * 0.5 + 0.5;

};

/**
 * Tween.js extension
 */

setInterval(function() {
	TWEEN.update();
}, 1000/120)

jt.extension('TWEEN', TWEEN);